Merge pull request #17558 from IDisposable/fix/set-cache-to-private

Switch SQLite connection Cache to Private

src/Jellyfin.Database/Jellyfin.Database.Providers.Sqlite/SqliteDatabaseProvider.cs

@@ -63,7 +63,11 @@ public sealed class SqliteDatabaseProvider : IJellyfinDatabaseProvider
         var sqliteConnectionBuilder = new SqliteConnectionStringBuilder
         {
             DataSource = GetOption(customOptions, "path", e => e, () => Path.Combine(_applicationPaths.DataPath, "jellyfin.db")),
-            Cache = GetOption(customOptions, "cache", Enum.Parse<SqliteCacheMode>, () => SqliteCacheMode.Default),
+            // Private, not Default: sqlite3_enable_shared_cache is process-global, so a plugin
+            // enabling it makes these connections share a cache too. Contention then surfaces as
+            // SQLITE_LOCKED ("database table is locked"), which the busy handler does not cover,
+            // so busy_timeout is skipped and the command fails at CommandTimeout instead.
+            Cache = GetOption(customOptions, "cache", Enum.Parse<SqliteCacheMode>, () => SqliteCacheMode.Private),
             Pooling = GetOption(customOptions, "pooling", e => e.Equals(bool.TrueString, StringComparison.OrdinalIgnoreCase), () => true),
             DefaultTimeout = GetOption(customOptions, "command-timeout", int.Parse, () => 60)
         };